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Direct photon cross section with conversions at CDF

CollaborationWith : Clark, Allan Geoffrey / D'Onofrio, Monica / Wu, Xin
Published in Physical Review. D. 2004, vol. 70, no. 07, p. 074008
Abstract We present a measurement of the isolated direct photon cross section in pp¯ collisions at s√=1.8  TeV and |η|<0.9 using data collected between 1994 and 1995 by the Collider Detector at Fermilab (CDF). The measurement is based on events where the photon converts into an electron-positron pair in the material of the inner detector, resulting in a two track event signature. To remove π0→γγ and η→γγ events from the data we use a new background subtraction technique which takes advantage of the tracking information available in a photon conversion event. We find that the shape of the cross section as a function of photon pT is poorly described by next-to-leading-order QCD predictions, but agrees with previous CDF measurements.
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CDF COLLABORATION. Direct photon cross section with conversions at CDF. In: Physical Review. D, 2004, vol. 70, n° 07, p. 074008. https://archive-ouverte.unige.ch/unige:38066

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Deposited on : 2014-06-24

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